the problem is the smoke unit? I have the red one. never had problems 'smoking'. sometimes it smokes too much. wash the smoke unit with Isopropyl alcohol. remove the body and press the brass contact under the smoke unit upwards so it touches better the hot pole of the seuthe unit. it isn't a question of power supply!!!

Hi!
A #24 will give less smoke than a #20. Maybe try several #20 as the production series may have some variations.

Make sure the red (B or centre rail) and brown (0 or outer rail) wires are not swapped. You'll get less smoke when they are swapped.

You can try running the MS2 with 16 V AC. Then you'll have about the same track voltage as with the old 6021. The CS3 has a lower voltage than the 6021 and cannot be used with AC.

Thank's again for all the advice! Yes, sometimes they just burn out or become too sooty. Adrian, did you used to live in Michigan? It seems I recall a young Australian man in the early 90's in Southfileld at Del's train center. You and your wife just had a newborn son. My recollection was jarred when I saw a post of yours from 2018 about visitng Tony's trains and toys in Brisbane. I connected with a couple there on I.G. during the covid lockdown. One is the Veternaian of Fortitude Valley vet. hospital.
Tom, I love your "All products in all scales compatible with all." Yes, if you buy the items to make them. Us Italians think sometimes alike.
HO, As far as connecting the MS2 to 16 volts, it won't hurt that locomotive as it is an fx, not mfx. I have read even on this forum that too much wattage can ruin an mfx decoder if a short happens due to derailment, etc. However, the CS3 120 volt power pack I have set to 19v. a/c. The amperage may be less than with an old trafo. and 6021 controller. You can not use a track box with a CS3. Thusly, it has ports on the front for 2 MS2's.
My new layout will already be complex enough without separating power blocks. I am retaining the original d.c. 4x8'ft. single track oval I began with before being bitten by the Marklin bug. I have some nice Roco d.c. analog and Fleischmann trains. I could convert them to dcc, as the CS3 will operate them as with TRIX, but that entails much cost and work.

Thank's and yes, I do have a 6021 still, and the big blue trafo. I connected it up, and set the br 10 on tracks to test smoke. Nothing. I made sure the C track spade connectors were the correct polarity, and the wires to the 6021, but I will double check them.
Meanwhile, I'm going to reinstall the Seuth 20, and check for good contact from the lcoco. frame circuit board contact. Neither have been used a lot.
My white 6001 digital style trafo. died. I think I may have left it plugged in overnight once too many, or when I was using it as a booster with the older Delta control it may have been shorted. I may have only had two C rail insulators for each block, not 4 to isolate both rails from the adjoining power section. Live and learn.